Knife sharpener



FIG. 1 is a side elevational view of the knife sharpener showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is an end elevational view thereof;

FIG. 4 is a perspective view thereof with the lid portion being omitted for purposes of disclosure;

FIG. 5 is a perspective view thereof with the sharpener being omitted for purposes of disclosure;

FIG. 6 is a sectional view thereof taken along line 6--6 of FIG. 1;

FIG. 7 is a sectional view thereof taken along line 7--7 of FIG. 2;

FIG. 8 is a bottom plan view thereof. 

The ornamental design for a knife sharpener, as shown and described. 